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;;; Module for termios interaction from Guile,
;;; Since that for some reason isn't built in.
;; /usr/include/bits/termios.h
(define-module (terminal termios)
:use-module (system foreign)
:use-module (ice-9 format)
:use-module (ice-9 rdelim)
:use-module (srfi srfi-9) ; records
:use-module (util)
:export (make-termios
copy-termios
tcsetattr! tcgetattr! cfmakeraw!))
;;; Constants, TODO, auto parse these from
;; /usr/include/bits/termios.h
(define-public ECHO 0000010)
(define-public ICANON 0000002)
;; @var{when} values
(define-public TCSANOW 0)
(define-public TCSADRAIN 1)
(define-public TCSAFLUSH 2)
;; Create the @code{#$} reader macro for creating C bindings.
;; For example
;; @example
;; #$ tcgetattr : int, * → int
;; @end example
;; would create a binding to a C function called tcgetattr, with the type
;; int, * → int, and bind it to a scheme procedure of the same name.
;;
;; Currently only links to the library stored in the variable lib, when called.
(eval-when (compile)
(read-hash-extend
#\$ (lambda (c port)
(let* ((name (string-trim-both (read-delimited ":" port)))
(input (read-delimited "→" port))
(out (string->symbol (string-trim-both (read-line port)))))
`(define ,(string->symbol name)
(pointer->procedure
,out (dynamic-func ,name lib)
(list
,@(map (lambda (symb) (if (eq? symb '*) (quote '*) symb))
(map (compose string->symbol string-trim-both)
(string-split input #\,))))))))))
(define (empty-values struct-type)
(cond ((null? struct-type) '())
((list? struct-type)
(cons (empty-values (car struct-type))
(empty-values (cdr struct-type))))
(else 0)))
(define struct-termios
(let ((cc-t uint8)
(speed-t unsigned-int)
(tcflag-t unsigned-int)
(NCCS 32))
(list tcflag-t tcflag-t tcflag-t tcflag-t
cc-t (make-list NCCS cc-t)
speed-t speed-t)))
;; Representation of a termios struct. @var{ptr} should always hold a valid
;; reference to a C object, and @var{list} should hold a parsed version of the
;; same data.
(define-record-type <termios>
(%make-termios ptr list)
termios?
(ptr as-ptr)
(list as-list))
(define* (make-termios #:optional (data (empty-values struct-termios)))
(%make-termios (make-c-struct struct-termios data) data))
(define (copy-termios termios)
(let ((lst (as-list termios)))
(%make-termios (make-c-struct struct-termios lst) lst)))
;; Sets the pointer value in termios directly. Also parses the data and sets the list.
(define (set-ptr! t v)
((record-modifier <termios> 'ptr) t v)
((record-modifier <termios> 'list) t (parse-c-struct v struct-termios)))
;; Sets the list value in termios directly. Also creates a C struct of the data
;; and stores that.
(define (set-list! t v)
((record-modifier <termios> 'list) t v)
((record-modifier <termios> 'ptr) t (make-c-struct struct-termios v)))
;; TODO {i,o}speed should be looked up in a table.
;; TODO bit fields should display what their fields mean
((@ (srfi srfi-9 gnu) set-record-type-printer!)
<termios>
(lambda (t p)
(format p "#<termios iflag=~b oflag=~b cflag=~b lflag=~b line=~d ispeed=~d ospeed=~d cc=~s>"
(iflag t) (oflag t) (cflag t) (lflag t) (line t) (ispeed t) (ospeed t)
(map integer->char (filter (negate zero?) (cc t))))))
;; Macro for creating accessor bindings for slots in a list, which are wrapped
;; inside a <termios> record. Called exactly once below.
(define-macro (create-bindings! . symbols)
`(begin ,@(map-each
(lambda (symb i)
`(define-public ,symb
(make-procedure-with-setter
(lambda (t) (list-ref (as-list t) ,i))
(lambda (t v) (let ((lst (as-list t)))
(list-set! lst ,i v)
(set-list! t lst))))))
symbols)))
(create-bindings! ; accessors
iflag oflag cflag lflag line cc ispeed ospeed)
;; TODO this should possibly use unwind guards
(define (with-ptr termios proc)
(let ((ptr (as-ptr termios)))
(let ((ret (proc ptr)))
(set-ptr! termios ptr)
ret)))
(define-once lib (dynamic-link))
#$ tcsetattr : int, int, * → int
(define* (tcsetattr! termios #:optional
(port (current-input-port))
(when TCSANOW))
(with-ptr termios (lambda (ptr) (tcsetattr (port->fdes port) when ptr))))
#$ tcgetattr : int, * → int
(define* (tcgetattr! termios #:optional (port (current-input-port)))
(with-ptr termios (lambda (ptr) (tcgetattr (port->fdes port) ptr))))
#$ cfmakeraw : * → int
(define* (cfmakeraw! termios)
(with-ptr termios cfmakeraw))
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